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Sandstorms contribute to the atmospheric microplastic pollution: Transport and accumulation from degraded lands to a megacity
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Researchers studied how sandstorms transport microplastics from degraded lands to a major city and found surprisingly high deposition rates during storm events. They traced the transport pathways and discovered that sandstorms can carry microplastics hundreds of kilometers, significantly increasing urban atmospheric microplastic levels. The study reveals that degraded and arid landscapes serve as important but overlooked sources of airborne microplastic pollution.
Surface dust from degraded lands is a major global aerosol source, mobilized by meteorological events like sandstorms. Microplastics (MPs) in dust can be enriched in the atmosphere and transported over long distances to sensitive regions during sandstorms. This study was conducted in a megacity frequently impacted by sandstorms in spring, exploring the influx, characteristics, enrichment mechanism, and transport pathway of sandstorm-derived MPs. The deposition rate of these MPs reached 1823.65 ± 892.53 items·m·d, predominantly consisting of low-density polymers and those mainly used in synthetic fiber, with an average size of 60.75 µm. Compared to MPs in annual atmospheric deposition, these MPs were smaller and contained a higher proportion of potentially harmful polymers. These factors could increase exposure risks for residents from sandstorm-derived MPs, along with distinct meteorological and ecological effects. Backward trajectory analysis suggested the observed sandstorms originated from the Mongolian Plateau, over 1000 km away. Comparisons of MPs from surface-collected dust on the Mongolian Plateau with sandstorms-delivered MPs revealed the transport was determined by MP shape, size, and density. This study highlights the critical role of sandstorms in the MP atmospheric cycling, emphasizing the extensive impacts of MPs and the need for coordinated mitigation efforts across regions.
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A neglected transport of plastic debris to cities from farmland in remote arid regions
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Researchers found that wind erosion in semiarid farmland regions transports significant quantities of plastic debris, including microplastics, to distant urban areas, identifying a previously neglected long-range transport pathway in arid environments.
Dust storms as a means of transport for microplastics in the atmosphere
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This study investigated whether dust storms in arid and semi-arid regions can transport microplastics from soils over long distances in the atmosphere. The results suggest that dust storms are a significant but underappreciated vector for microplastic dispersal to remote regions.
Atmospheric transport of microplastics during a dust storm
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Researchers analyzed microplastics deposited during a dust storm in Shiraz, Iran, and found concentrations ranging from 0.04 to 1.06 particles per gram of dust. The study suggests that the majority of microplastics originated from distant desert sources rather than local urban areas, indicating that dust storms may be a significant mechanism for transporting and redistributing microplastics across arid regions.
Resuspension of microplastic particles from arid regions and global impacts on atmospheric concentrations and deposition
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Researchers modeled how microplastics from arid and semi-arid regions are resuspended by wind and transported globally through the atmosphere. The simulations showed that desert regions can be significant secondary sources of airborne microplastic particles, contributing to plastic deposition even in remote ecosystems far from human activity.
Atmospheric Resuspension of Microplastics from Bare Soil Regions
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Researchers developed a method to estimate how microplastics get lifted from bare soil into the atmosphere along with mineral dust, then modeled their global transport and deposition. They found that this soil-based resuspension is a meaningful source of atmospheric microplastics, with fiber-shaped particles traveling significantly farther than spherical ones. The study suggests that dust storms and wind erosion from agricultural and arid lands may be an underappreciated pathway for spreading microplastic contamination worldwide.
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When a large batch of papers lands in the Atlas, we read through it and send a short write-up of what stood out.